A.O. Smith ATI-240H-N, ATI-240H-P, ATI-340H-N, ATI-340H-P, ATI-540H-N User Manual
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Residential / Commercial Gas
Tankless Water Heaters
TANKLESS HIGH EFFICIENCY
CONDENSING WATER HEATERS
Ultra-Low NOx gas tankless water heaters with condensing technology featuring
an unprecedented 0.95 Energy Factor which lowers operating costs and is
environmentally friendly.
FEATURES:
CONTINUOUS MAXIMUM FLOW
RATES UP TO 10.0 GPM
ENERGY STAR® QUALIFIED
AVAILABLE IN NATURAL GAS OR
PROPANE (LP)
540 MODELS
• Can be used in residential and commercial
applications
• Easy-link up to 4 heaters
• Multi-link up to 20 heaters
INDOOR MODEL
• Includes integrated temperature controls
and advanced diagnostics to simplify
troubleshooting
• Factory-installed power cord
OUTDOOR MODEL
• Includes a wall mount temperature remote
controller and advanced diagnostics to
simplify troubleshooting
DURABLE HEAT EXCHANGER:
• Primary heat exchanger is constructed of
a commercial-grade copper that is more
resilient to erosion. Copper is 25x better
at heat transfer than stainless steel thus
stabilizing outgoing water temperatures
quicker.
• Secondary Heat Exchanger is made of Type
316L Stainless Steel to protect against
corrosion.
COMMON VENT UP TO 8 UNITS
SAFETY FEATURES:
• Air-Fuel Ratio (AFR) Sensor
• Exhaust & Water Temperature Safety
Control
• Overheat Cut-Off Fuse
INTERNAL FREEZE PROTECTION
SYSTEM
POWER DIRECT VENT DESIGN
• Category III or IV venting can be used
• Exhaust, 3” PVC Venting up to 70 Feet or
4” PVC Venting up to 100 Feet
• Provides flexible venting with PVC, CPVC,
or ABS Pipe for Intake and Exhaust (solid
core only). Canadian Installations Require
ULCS636 Listed PVC or CPVC Pipe for
Venting.
ACCESSORIES
• Pipe Cover
• Neutralizer Kit
• Isolation Valve Kits
• Concentric Termination
• Product Preservers® Anti-Scale System
• Multi-Unit Controller (540 Model Only)
• Commercial Remote Temperature Control
(540 Model Only)
WARRANTY
• 15-year limited warranty on heat exchanger
in residential applications
• 6-year limited warranty on heat exchanger
in commercial applications
• 5-year warranty on all parts
INDOOR MODELS
ATI-240, ATI-340, ATI-540
OUTDOOR MODELS
ATO-240, ATO-340, ATO-540
COMPLIES WITH LEAD FREE
STANDARDS
©September 2016 A. O. Smith Corporation. All Rights Reserved
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
540 models
only
ANSI Z21.10.3 CSA 4.3
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AOSRG46835
TANKLESS HIGH EFFICIENCY CONDENSING MODELS
Residential / Commercial Gas
Tankless Water Heaters
Model
Number
Indoor Models
ATI-240H-N Natural 15,000 160,000 4.0 10.5 0.95 6.6 3/4” NPT 3/4” NPT 23-5/8 17-3/4 11-1/4 58
ATI-240H-P Propane 13,000 160,000 8.0 14.0 0.95 6.6 3/4” NPT 3/4” NPT 23-5/9 17-3/4 11-1/4 58
ATI-340H-N Natural 15,000 180,000 4.0 10.5 0.95 8 3/4” NPT 3/4” NPT 23-5/8 17-3/4 11-1/4 58
ATI-340H-P Propane 13,000 180,000 8.0 14.0 0.95 8 3/4” NPT 3/4” NPT 23-5/8 17-3/4 11-1/4 58
ATI-540H-N Natural 15,000 199,000 4.0 10.5 0.95 10 3/4” NPT 3/4” NPT 23-5/8 17-3/4 11-1/4 59
ATI-540H-P Propane 13,000 199,000 8.0 14.0 0.95 10 3/4” NPT 3/4” NPT 23-5/8 17-3/4 11-1/4 59
Outdoor Models
ATO-240H-N Natural 15,000 160,000 4.0 10.5 0.95 6.6 3/4” NPT 3/4” NPT 23-5/8 17-3/4 11-1/4 58
ATO-240H-P Propane 13,000 160,000 8.0 14.0 0.95 6.6 3/4” NPT 3/4” NPT 23-5/8 17-3/4 11-1/4 58
ATO-340H-N Natural 15,000 180,000 4.0 10.5 0.95 8 3/4” NPT 3/4” NPT 23-5/8 17-3/4 11-1/4 58
ATO-340H-P Propane 13,000 180,000 8.0 14.0 0.95 8 3/4” NPT 3/4” NPT 23-5/8 17-3/4 11-1/4 58
ATO-540H-N Natural 15,000 199,000 4.0 10.5 0.95 10 3/4” NPT 3/4” NPT 23-5/8 17-3/4 11-1/4 59
ATO-540H-P Propane 13,000 199,000 8.0 14.0 0.95 10 3/4” NPT 3/4” NPT 23-5/8 17-3/4 11-1/4 59
15-150 PSI Water Pressure. 40 PSI or above recommended for maximum flow.
*Current numbers based on factory testing; 0.5 GPM for activation; 0.4 GPM required for continuous fire after initial ignition.
Indoor models are certified from sea level to 10,100 ft. elevations. Outdoor models are certified from sea level to 6,000 ft. elevation.
Type
Gas Consumption Input Inlet Gas Pressure
Minimum
BTU/H
Maximum
BTU/H
Minimum
in. W.C.
Maximum
in. W.C.
Energy
Factor
(EF)
Maximum
GPM*
Hot/Cold
Connections
Gas
Connection
Dimensions in Inches
Height Width Depth
Unit
Weight
(lbs)
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AOSRG46835
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